Some ideas with water
Ancient Ice Mirror
Cost: 1
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Artifact
4
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: Exchange control of Magical Mirror with target creature or permanent
Brain Parasite
Cost: 2
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Creature
0/1
4
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: Gain control of target creature as long as Brain Parasite is in play and do not use its ability
Flying Fish
Cost: 2
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Creature
6/6
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: Dive
Flying Fish die at end of turn if not being drown